Power filter



FIG. 1 is a perspective view of a power filter showing my new design;

FIG. 2 is another perspective view;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a rear elevation view thereof;

FIG. 5 is a left side elevation view thereof ;

FIG. 6 is a right side elevation view thereof;

FIG. 7 is a top plan view thereof; and,

FIG. 8 is bottom plan view thereof. 

The ornamental design for a power filter, as shown and described. 